title: Quantitative evaluation of laboratory uptake rates for pesticides, pharmaceuticals, and steroid hormones using POCIS.
abstract: Polar organic chemical integrative samplers (POCIS) are useful in monitoring for a wide range of chemicals in aquatic systems; however, a lack of available uptake rate data for compounds of environmental interest is one limitation in the application of these samplers to environmental studies. In this study, laboratory calibration experiments were conducted with POCIS for 65 compounds at 25°C under flowing conditions to determine chemical-specific uptake rates (R(s)). Experimental uptake rates measured in this study ranged from 0.034 to 1.33 L/d, and uptake rates were determined for 36 compounds with no previously reported values. Experimentally determined uptake rates were applied to data obtained from POCIS samplers deployed downstream of three wastewater treatment plant (WWTP) effluent discharges and in four surface waters influenced by agricultural runoff. Time-weighted average concentrations for atrazine and metolachlor determined using uptake rates generated in this study compare well with results from composited grab sampling previously conducted in agricultural watersheds in Nebraska, USA.
authors.affiliation: University of Nebraska-Lincoln, Lincoln, Nebraska, USA. sbartelt2@unl.edu
authors.forename: Shannon L
authors.initials: SL
authors.lastname: Bartelt-Hunt
authors.forename: Daniel D
authors.initials: DD
authors.lastname: Snow
authors.forename: Teyona
authors.initials: T
authors.lastname: Damon-Powell
authors.forename: DelShawn L
authors.initials: DL
authors.lastname: Brown
authors.forename: Gyanendra
authors.initials: G
authors.lastname: Prasai
authors.forename: Matthew
authors.initials: M
authors.lastname: Schwarz
authors.forename: Alan S
authors.initials: AS
authors.lastname: Kolok
mesh_terms: D000081:Acetamides / Q000032:analysis; D001280:Atrazine / Q000032:analysis; D002138:Calibration; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D005618:Fresh Water / Q000737:chemistry; D009329:Nebraska; D010575:Pesticides / Q000032:analysis*; D004364:Pharmaceutical Preparations / Q000032:analysis*; D013256:Steroids / Q000032:analysis*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D000081:Acetamides; D010575:Pesticides; D004364:Pharmaceutical Preparations; D013256:Steroids; D014874:Water Pollutants, Chemical; D001280:Atrazine; C051786:metolachlor